Everyone ages 6 months and older is now eligible to receive a COVID-19 vaccine in Texas. Search for free COVID19 testing locations that are convenient for you and schedule an appointment.The polymerase extends the primers in the 5' to 3' direction. Eligible F-1 students with STEM degrees may apply for a 24-month STEM OPT extension. No Band or Faint Band ; Extension time was too short, If the extension time is too short, there will be insufficient time for complete replication of the target.